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st: re: output from mata:variance


From   Kit Baum <baum@bc.edu>
To   statalist@hsphsun2.harvard.edu
Subject   st: re: output from mata:variance
Date   Sat, 6 Mar 2010 14:42:14 -0500

<>
No need for all this code:

//get this result w/o -mata-
preserve
stack mpg length , into(newvar) clear
su n, d
local varmpglength=r(Var)
restore
di `varmpglength'

with Mata, all you need is

sysuse auto, clear
mata:st_numscalar("vv",variance(vec(st_data(.,("mpg","length")))))
di vv

Kit Baum   |   Boston College Economics & DIW Berlin   |   http://ideas.repec.org/e/pba1.html
                              An Introduction to Stata Programming  |   http://www.stata-press.com/books/isp.html
   An Introduction to Modern Econometrics Using Stata  |   http://www.stata-press.com/books/imeus.html


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